using System;

namespace Assignment_2
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
    public interface IParcelProcessorOnline
    {
        public abstract bool ValidateParcelPaymentInfo();
        public abstract bool HasBeenShipped();
    }

    public interface IParcelProcessorCash
    {
        public abstract void ProcessParcel();
    }

    public class OnlinePaymentOrder : IParcelProcessorOnline, IParcelProcessorCash
    {

        public bool HasBeenShipped()
        {
            return true;
        }
        public bool ValidateParcelPaymentInfo()
        {
            return true;
        }
        public void ProcessParcel()
        {
            //process if everything is ok.
        }
    }

    public class CashOnHandPaymentOrder : IParcelProcessorCash
    {
        public void ProcessParcel()
        {
            //process if everything is ok.
        }
    }

}